在PyCharm中运行PyQt5窗口程序时，出现了下图所有的错误提示。
出现该问题的原因是环境变量没有添加。
解决方法：
在环境变量中增加：
QT_QPA_PLATFORM_PLUGIN_PATH
路径：C:\Program Files\Python38\Lib\site-packages\PyQt5\Qt\plugins
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